Changing Perspective

Once, when we were children (same mistakes we is plural.), we always thought (past tense) that this world was just a massive playground. Everything we saw we thought as toys. We made (an empty) the empty plastic bottle as a ball, kicking it as far as we like. We made the paper boat after the rain; let it go following into the drain streams.

Now, all the enjoyable moments we had before as a child are more likely to become the sweet memories of our life. But, now, the idea of the world as a massive playground has turned (now is present, no past tense had)  to more serious perspectives. As adults, we know that the world is a place where we find jobs, get the money, and survive the world economy. We have no time playing like before and now always rushing to our job places and work from 8 to 5 repeatedly every day.

Our perspective towards the world and life is always changing. When we were children, we thought the world is our playground, but when in school and university we think that our mainly idea of  for living is just for exams. When we have a job, we change the idea of life to work and earn money today to survive for tomorrow. The perspectives always change, because there is no real concept, no main idea of what the life is and what we need to do actually.

Just learn to write in plural and I might be satisfied. How can we be child?